The district said it was notified of the threat at 9:30 a.m. Friday. School officials contacted the Eaton County Sheriff's Department, who performed a search of the high school and did not find anything to indicate that the threat was credible.

Students remained in lockdown as the sheriff's department searched the school.

The district asked parents not to attempt to remove their children from class, because it would interfere with the assessment of the situation.

The Eaton County Sheriff's Department did not immediately respond to requests for comment.

Check back for updates.

Contact Kara Berg at 517-377-1113 or kberg@lsj.com. Follow her on Twitter @karaberg95.